Research Progress on Creep Damage of Solid Propellants

Creep is a core pathway for damage accumulation in solid propellants during long‐term storage and service, directly affecting the structural integrity of solid rocket motor grains. At present, there are bottlenecks in the research on creep damage of solid propellants, with no breakthroughs achieved in the laws of damage accumulation at various stages of creep, high‐precision constitutive models, research on mesoscopic creep damage evolution, and research on creep damage inhibition. This paper systematically reviews domestic and international research results on the mechanical response characteristics and constitutive models at various stages of macroscopic creep of solid propellants, analyzes the potential application of current mesoscopic observation technologies in the characterization of creep damage evolution, and summarizes the implementation effects and action mechanisms of inhibiting creep damage from the perspective of internal and external influencing factors. In view of the current bottlenecks, it points out the future research directions of solid propellants creep damage, providing theoretical support and technical reference for the evaluation of solid propellants creep damage and the optimization of model prediction under long‐term storage conditions.